OnGuard Brute LS 8000 Bike Lock Review: Security, Durability & DIY Mount

This review dives deep into the OnGuard Brute LS 8000 bike lock, evaluating its security features, durability, and practicality. We'll explore its strengths and weaknesses, examining its robust 16.8mm shackle, quatro locking mechanism, and versatile 10.24" long shackle. We'll also assess the build quality, including a discussion of potential weak points like the hard plastic bottom, and the surprising absence of a mounting bracket. The review will cover key features like the included keys (one with a built-in flashlight!), and the lock's resistance to picking.Ultimately, this comprehensive review will determine whether the OnGuard Brute LS 8000 lives up to its reputation as a strong, reliable, and affordable security solution for cyclists. We’ll cover our experience with the lock, including a DIY mounting bracket solution to compensate for the manufacturer's omission, and compare it to a leading competitor, the Kryptonite Evolution Mini-7. Read on to discover if this lock is the right choice for your bike and your peace of mind.

Pros And Cons

ONG Guard Brute LS 8000 U-lock
  • One of the heaviest and strongest locks on the market
  • 16.8 mm thick shackle (almost as thick as Kryptonite Evolution Mini-7 U-lock)
  • Quatro locking mechanism (locks both sides of each shackle)
  • Long shackle (10.24" length, 4.37" width)
  • Includes five keys, one with a flashlight
  • Key registration for replacement keys
  • Metal shutters in keyhole prevent picking
  • Smooth operation
  • Hard plastic bottom can crack (one arrived cracked)
  • No mounting bracket included (as advertised)
  • Long shackle might be vulnerable to bottle jack attacks (though the reviewer considers this unlikely)

Read more: Top 5 Folding Bike Locks for Ultimate Security

Lock Security and Build

The OnGuard Brute LS 8000 boasts a substantial 16.8mm shackle, just shy of the Kryptonite Evolution Mini-7's thickness, making it one of the market's most robust locks. Its quatro locking mechanism secures both sides of the shackle, significantly hindering cutting attempts. This design prevents the lock from spinning open, a vulnerability in older models.

Close-up of the thick shackle
Close-up of the thick shackle

The 8000 series differs cosmetically from the 5000 series, featuring a yellow rubber coating for better grip and protection. However, the hard plastic bottom remains a potential weak point, prone to cracking, as experienced with my own unit.

Diagram illustrating the quatro locking mechanism
Diagram illustrating the quatro locking mechanism

Shackle Length and Potential Vulnerabilities

The LS model's 10.24" long shackle offers increased versatility, useful for locking around larger objects. Its 4.37" width also adds to its adaptability. However, some argue the longer shackle is a potential weakness, offering more leverage for tools like bottle jacks.

Measurements of the shackle length and width
Measurements of the shackle length and width

While this concern exists, it's mitigated by proper locking technique, minimizing gaps. For high-value bikes, combining the OnGuard Brute LS 8000 with additional security measures is recommended.

Keys and Pick Resistance

The lock comes with five identical keys, plus one with a built-in flashlight for low-light situations. Online key registration allows for replacements should you lose all your keys. The keyhole is protected by small metal shutters, making picking incredibly difficult.

The flat key design further enhances pick resistance. The smooth and easy operation of the key is also notable.

Mounting Bracket and DIY Solution

While the packaging advertises a mounting bracket, it's notably absent. Many reviews mention this omission. The lack of a bracket is a significant drawback, requiring a DIY solution.

Packaging showing the missing mounting bracket
Packaging showing the missing mounting bracket

I followed a YouTube tutorial (link in description) to create a mounting bracket using PVC pipe, electrical tape, rubber bands, and zip ties. This custom solution effectively secures the lock to the bike frame.

The homemade PVC mounting bracket
The homemade PVC mounting bracket

Conclusion and Recommendation

The OnGuard Brute LS 8000 offers excellent security features, including a thick shackle and a robust locking mechanism. Its long shackle provides versatility, though some potential weaknesses exist. The lack of a mounting bracket is disappointing, but easily remedied with a DIY solution.

Final shot summarizing the review
Final shot summarizing the review

Despite the missing bracket and a pre-existing crack on my model, the OnGuard Brute LS 8000 remains a reliable and secure option for cyclists. The build quality, high pick resistance, and relatively affordable price make it a strong contender. It's slightly cheaper and more versatile than the Kryptonite Evolution Mini-7, making it my preferred choice.